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Write the word phrase as an algebraic expression, using x as the variable. See Example.EXA...

Write the word phrase as an algebraic expression, using x as the variable. See Example.

EXAMPLE Using Variables to Write Word Phrases as Algebraic Expressions

Write each word phrase as an algebraic expression, using x as the variable.

(a)

(b)

x − 7 is incorrect. We cannot subtract in either order and get the same result.

(c)

Compare this result with “12 subtracted from a number,” which is x − 12.

(d)

(e)

(f)

We are multiplying 2 times “something.” This “something” is the difference between a number and 8, written x − 8. We use parentheses around this difference.

Suppose that the directions on a test read “Solve the following expressions.” How would you politely correct the person who wrote these directions?

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